Brake



L. E. LA BRIE July 25, 1933. 9

BRAKE Filed Oct. 24, 1930 INVENTOR. LUDGER E. LA BRIE A TTORNEY Patented July 25, 1933 UNITED? STATES PATIENT OFFICEF LUDGER LA 133111.01 SOUTH BEND, INDIANA, ASS IGNOR T0 BENDIX BRAKE COM PANY, OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS v BRAIKE'= Application filed'october 24, 1930. Serial 110.490.885.

This invention relates to brakes and is illustrated as embodied in an internal expanding brake for an automobile. An object of the invention is to provide a simple and positive applying device for the friction means of the brake, preferably of a sort which 18 adapted for use in a brake of the shlftableanchorage type. In the arrangement illustrated, the ends of the brake friction means are connected by pivoted linksto a floating lever which extends between said ends and which is operatively pivoted at one end to theend of a crank arm carried by a brakeoperating shaft. The shaft is preferably supported by and arranged to extend through the backing plate of the brake so that it forms the equivalent of the usual cam shaft.

The above and other ob]ects and features of the invention, including various novel and.

desirable details of constructi0n -will be apparent from the following description of t e illustrative embodiment shown 1n the accompanying drawing, in which:

Figure 1 is a vertical section through the brake just inside the head of the brake drum and showing the brake shoes in side elevation;

Figure 2 is a partial section on the line 22 of Figure land showing the above-descnbed floating lever; and w Figure 3 is a partial section on the line 3 -3 of Figure 1 and showing the above-described shaft with its crank arm.

The illustrated brake, which is of the shift able-anchorage type, includes a rotatable drum 10, at the open. side ofwhich is arranged a supportsuch as a backing plate 12 and within which is arranged the frlction means of the brake. The illustrated friction means includes-a pair of shoes 14 and 16 con nected by a suitable adjustable oint. 18

mounted on pivots 20 carried by the lower means is provided with any suitable steady rests or the like 26. The brake is applied agalnst the resistance of a main return spring 28 tension-ed between the shoes and an auxil-' iary return spring 30 tensioned between the shoe 14 and the backing plate 12.

According to the present invention, the

brake is applied by novel means, including a shaft 32 shown as being journaled in a bearing 34 carried by the backing plate 12 and which has at its brake end a crank arm 36 shown as being forged integrally of the shaft. The lower end of the crank arm 36 isconnected by means such as a pivot 38 to a floating lever 40 which extends upwardly between the ends of the shoes 14 and 16. The upper end of the floating lever 40 is pivoted to one end of athrust link 42, the opposite end of which 1s pivoted directly to the end of the shoe 16, wlnle an intermediate partof the lever 40 is pivoted to a thrust link 44, the opposite end of which is pivoted directly to the end of the shoe-14. g

It will'be seen that rocking the'shaft' 32 to apply the brake tends to rock the floating lever 40 about its connection to the link 42 to thrust through the link 44 against the shoe 14, while the lever also tends to fulcrum.

automobile is moving forward, while the thrust on the shoe 16 is effective when the 1y powerful braking action is not necessary.

While one illustrative embodiment has been described in detail, it is not my intention to limit the scope of the invention to that particular embodiment or otherwise than by the terms of the appended claims.

automobile is moving backward and extreme- 90 14 is effective in applying the brake when the I claim:

1. A brake comprising a backing plate having a floating friction device mounted thereon which is arranged to shift to anchor at one or the other of its ends, in combination with a shaft supported by the backing plate and having a crank arm adjacentthe ends of the friction device, a floating lever pivoted to the end of the crank arm and extending between the ends of the friction device, and oppositely extending links, one of which connects the end of the floating lever to one end of the friction device and the other of which connects an intermediate portion of the floating lever to the other end of the friction device.

ly, the connections between the thrust links and said ends being at substantially the same distances radially from the center of the brake and the links being differently inclined ac-' cordingly. 1

LUDGER E. LA BRIE. 

